Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session S12: Light Mesons and Baryons |
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Sponsoring Units: DNP GHP Chair: William Briscoe, George Washington University Room: Roosevelt 4 |
Monday, January 30, 2017 1:30PM - 1:42PM |
S12.00001: Disentanglement of Electromagnetic Baryon Properties Daniel Sadasivan, Michael Doring Through recent advances in experimental techniques, the precise extraction of the spectrum of baryonic resonances and their properties becomes possible. Helicity couplings at the resonance pole are fundamental parameters describing the electromagnetic properties of resonances and enabling the comparison of theoretical models with data. We have extracted them from experiments carried out at Jefferson Lab and other facilities using a multipole analysis within the Julich-Bonn framework. Special attention has been paid to the uncertainties and correlations of helicity couplings. Using the world data on the reaction $\gamma p\to\eta p$, we have calculated, for the first time, the covariance matrix. Our results are useful in several ways. They quantify uncertainties but also correlations of helicity couplings. Second, they can tell us quantitatively how useful a given polarization measurement is. Third, they can tell us how the measurement of a new observable would constrain and disentangle the resonance properties which could be helpful in the design of new experiments. Finally, on the subject of the {\it missing resonance problem}, model selection techniques and statistical tests allow us to quantify the significance of whether a resonance exists. [Preview Abstract] |
Monday, January 30, 2017 1:42PM - 1:54PM |
S12.00002: ABSTRACT WITHDRAWN |
Monday, January 30, 2017 1:54PM - 2:06PM |
S12.00003: Chiral Extrapolation of Light Mesons from the Lattice Bin Hu, Michael Doring, Maxim Mai, Raquel Molina, Andrei Alexandru The $\rho (770)$ meson is the most extensively studied resonance in lattice QCD simulations in two ($N_f=2$) and three ($N_f=2+1$) flavors. We analyze all available phase shifts from $N_f=2$ simulations using unitarized Chiral Perturbation Theory (UCHPT), and allowing not only for the extrapolation in mass but also in flavor, $N_f=2\to N_f=2+1$. The flavor extrapolation requires information from a global fit to $\pi\pi$ and $\pi K$ phase shifts from experiment. In the chiral extrapolations of $N_f=2$ simulations, the $K\bar K$ channel has a significant effect and leads to $\rho(770)$ masses surprisingly close to the experimental one. We also discuss recent results on the chiral extrapolations of $N_f=2+1$ lattice QCD data of the $\rho(770)$ meson and the $\sigma(600)$ that have become available. [Preview Abstract] |
Monday, January 30, 2017 2:06PM - 2:18PM |
S12.00004: ABSTRACT WITHDRAWN |
Monday, January 30, 2017 2:18PM - 2:30PM |
S12.00005: Radiative decay of $\eta^{\prime}$ at CLAS Georgie Mbianda Njencheu, Moskov Amaryan, Ilya Larin We will present preliminary experimental results of the radiative decay of $\eta^{\prime}\rightarrow\pi^{+}\pi^{-}\gamma$ based on CLAS data collected at Jefferson Lab during the photoproduction experiment $\gamma p\rightarrow p\eta^{\prime}$ for the center-of-mass energy from 1.96 to 2.72 $GeV$. The analysis is based on the highest statistics collected in this channel to date. This decay is sensitive to the box anomaly in gauge theory. [Preview Abstract] |
Monday, January 30, 2017 2:30PM - 2:42PM |
S12.00006: ABSTRACT WITHDRAWN |
Monday, January 30, 2017 2:42PM - 2:54PM |
S12.00007: Multi-Particle States in the Finite Volume Michael Doring, Dimitri Agadjanov, Maxim Mai, Ulf-G. Meissner, Akaki Rusetsky The extraction of hadron-hadron scattering parameters from lattice data by using the L\"uscher approach becomes increasingly complicated in the presence of inelastic channels. We propose a method for the direct extraction of the complex hadron-hadron optical potential on the lattice, which does not require the use of the multi-channel L\"uscher formalism. Moreover, this method is applicable without modifications if some inelastic channels contain three or more particles. [Preview Abstract] |
Monday, January 30, 2017 2:54PM - 3:06PM |
S12.00008: Photo-production of $\omega $ Meson Using CLAS at Jefferson Laboratory Zulkaida Akbar Photo-production of $\omega $ meson was studied using CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. We have obtained preliminary results on two observables that have been measured from the reaction $\gamma $p $\to $ p$\omega $ : the differential cross section and the double polarization observable \textbf{E}. The differential cross section measurement was performed using tagged photon beam with energy range up to 5.4 GeV, incident on unpolarized liquid hydrogen target. While the double polarization observable \textbf{E} was measured using circularly-polarized tagged photon beam with energy range up to 2.4 GeV and longitudinally-polarized butanol target. The differential cross section as well as the polarization observable allow us to find the N$^{\mathrm{\ast }}$ resonances that decay to p$\omega $ through multi-channel Partial Wave Analysis (PWA) method. They also provide a probe to test theoretical models about the production mechanism of $\omega $ meson and also the scaling behavior of the cross section. [Preview Abstract] |
Monday, January 30, 2017 3:06PM - 3:18PM |
S12.00009: Legendre Expansions for Two-Hadron Reactions Igor Strakovsky, Yakov Azimov, William Briscoe Modern experimental facilities and detectors provide tremendous volumes~ of detailed data. For two-hadron reactions, they are usually presented~as a set of multiple panels,~$e.g.$, angular distributions at many particular~energies. Such presentations lose visuality, and their physical content may~be extracted only through some model-dependent treatment. Instead, we~suggest to use expansion into the Legendre series with a relatively small~number of essential coefficients. This approach was applied in several~experimental investigations and demonstrated~its higher visualization.~This talk presents some general properties of the~Legendre coefficients~ which allow one to extract physical information even without any~model-dependent assumptions. [Preview Abstract] |
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